chore: add CONTRIBUTING.md

CONTRIBUTING.md

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+# How to contribute to the OIDC SDK for Go
+
+## Did you find a bug?
+
+Please file an issue [here](https://github.com/caos/oidc/issues/new?assignees=&labels=bug&template=bug_report.md&title=).
+
+Bugs are evaluated every day as soon as possible.
+
+## Enhancement
+
+Do you miss a feature? Please file an issue [here](https://github.com/caos/oidc/issues/new?assignees=&labels=enhancement&template=feature_request.md&title=)
+
+Enhancements are discussed and evaluated every Wednesday by the ZITADEL core team.
+
+## Grab an Issues
+
+We add the label "good first issue" for problems we think are a good starting point to contribute to the OIDC SDK.
+
+* [Issues for first time contributors](https://github.com/caos/oidc/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22)
+* [All issues](https://github.com/caos/oidc/issues)
+
+### Make a PR
+
+If you like to contribute fork the OIDC repository. After you implemented the new feature create a PullRequest in the OIDC reposiotry.
+
+Make sure you use semantic release:
+
+* feat: New Feature
+* fix: Bug Fix
+* docs: Documentation
+
+## Want to use the library?
+
+Checkout the [examples folder](example) for different client and server implementations.
+
+Or checkout how we use it ourselves in our OpenSource Identity and Access Management [ZITADEL](https://github.com/caos/zitadel).
+
+## **Did you find a security flaw?**
+
+* Please read [Security Policy](SECURITY.md).